An invasive Prosopis juliflora mesquite surrounding a ghaf, the UAE's national tree. Photo: Dr Ali El Keblawy
An invasive Prosopis juliflora mesquite surrounding a ghaf, the UAE's national tree. Photo: Dr Ali El Keblawy
An invasive Prosopis juliflora mesquite surrounding a ghaf, the UAE's national tree. Photo: Dr Ali El Keblawy
An invasive Prosopis juliflora mesquite surrounding a ghaf, the UAE's national tree. Photo: Dr Ali El Keblawy

Can the UAE combat this invasive tree by turning it into fertiliser?


Daniel Bardsley
  • English
  • Arabic

From carp outcompeting native species, through to zebra mussels multiplying in vast numbers, and knotweed damaging buildings, invasive species have been blamed for ecological and other harms across the planet.

The UAE has also fallen victim, notably with Prosopis juliflora, a Central American mesquite tree introduced to the country around five decades ago as part of afforestation efforts.

It is now found in large numbers across several emirates, particularly in the north-east of the country where it crowds out native plant species.

However, rather than attempt the difficult task of simply eliminating this invasive species, a UAE-based researcher has said that the juliflora could be harvested and then converted into biochar — a charcoal-like substance that is created by burning wood or other biomass at a high temperature without oxygen.

Handful of biochar. Courtesy of Black Bull Biochar
Handful of biochar. Courtesy of Black Bull Biochar

The proposal from Dr Ali El Keblawy, of the University of Sharjah, could bring several benefits. Biochar can improve the nutrient and water-retaining qualities of the soil, help reduce water use by the trees and store carbon in the soil.

“Biochar is organic material that can be [added] to nutrient-poor soil to enrich the soil fertility and enhance the physical, chemical properties. It can make the soil suitable for agriculture,” Dr El Keblawy said.

Biochar can be spread on soil and, unlike wood, is not broken down by microorganisms, remaining stable for tens or even hundreds of years instead of releasing its carbon quickly.

A pine sapling that has been treated with biochar, which can improve soil nutrient content and water retention. Photo: Black Bull Biochar.
A pine sapling that has been treated with biochar, which can improve soil nutrient content and water retention. Photo: Black Bull Biochar.

Previous research has suggested that the closely-related ghaf tree, Prosopis cineraria, which in 2008 was named the UAE’s national tree, is suitable for biochar.

Dr El Keblawy would like to secure funding to develop project to use the juliflora tree plant for biochar production.

Juliflora spreads easily because its seeds are eaten by animals and germinate after being released in faeces.

“It is really hard to be controlled. No animal can eat it, just the fruits. This means it is a non-grazeable plant,” said Dr El Keblawy.

“All the trials, not [just] here but globally, have failed to get rid of this species.”

Outcompeting other species

The tree uses a taproot several metres deep to extract large amounts of water — a very limited resource in the UAE. It also has a dense, shallow fibrous layer of roots nearer the surface that absorb nutrients and water from other plants.

Dr El Keblawy has supervised a PhD student who has uncovered further details about how the large roots help the tree to outcompete other species.

Dr Francois Mitterand Tsombou found that the roots of the juliflora extend several metres horizontally, compared to just 40cm or so for the roots of the ghaf tree.

“If there is anything growing from [above the root], the plant … will not have any chance to have humidity, to have nutrients,” Dr Tsombou said.

“The root of the exotic will capture all the water availability, all the nutrients and any native plant will not survive under the canopy of this one.”

Aside from its heavy consumption of water and nutrients, the juliflora tree suppresses the growth of native plants by releasing chemicals — a phenomenon known as allelopathy.

As part of his research, Dr Tsombou collected leaves of juliflora, another non-native tree, Prosopis pallida and the ghaf tree.

Laboratory tests showed that substances in the leaves of the juliflora had a “strongly negative” effect on the growth of other plants, an effect not seen with the leaves of the other two species.

In the juliflora's native territory, these chemicals are used to defend against animals that might eat the plant, but in the UAE they have the effect of suppressing other plant growth.

“The leaves of the Prosopis juliflora contain a lot of inhibitory chemicals that neutralise the growth native plant species,” Dr Tsombou said.

Aside from harming native species, the plant produces large quantities of pollen grains for much of the year, which can cause allergies for sensitive people.

The UAE is not the only country where the juliflora has caused issues. In Kenya, it was credited with creating a green, tree-covered landscape less prone to generating sandstorms.

However, as in the UAE, in Kenya, the plant’s seeds spread in the dung of animals and the tree has become difficult to control, causing the loss of grazing and croplands, the blocking of rivers and even the displacement of people from their homes.

Lexus LX700h specs

Engine: 3.4-litre twin-turbo V6 plus supplementary electric motor

Power: 464hp at 5,200rpm

Torque: 790Nm from 2,000-3,600rpm

Transmission: 10-speed auto

Fuel consumption: 11.7L/100km

On sale: Now

Price: From Dh590,000

Results

Men's finals

45kg:Duc Le Hoang (VIE) beat Zolfi Amirhossein (IRI) points 29-28. 48kg: Naruephon Chittra (THA) beat Joseph Vanlalhruaia (IND) TKO round 2.

51kg: Sakchai Chamchit (THA) beat Salam Al Suwaid (IRQ) TKO round 1. ​​​​​​​54kg: Veerasak Senanue (THA) beat Huynh Hoang Phi (VIE) 30-25.

57kg: Almaz Sarsembekov (KAZ) beat Tak Chuen Suen (MAC) RSC round 3. 60kg: Yerkanat Ospan (KAZ) beat Ibrahim Bilal (UAE) 30-27.

63.5kg: Abil Galiyev (KAZ) beat Nouredine Samir (UAE) 29-28. 67kg: Narin Wonglakhon (THA) beat Mohammed Mardi (UAE) 29-28.

71kg: Amine El Moatassime (UAE) w/o Shaker Al Tekreeti (IRQ). 75kg:​​​​​​​ Youssef Abboud (LBN) w/o Ayoob Saki (IRI).

81kg: Ilyass Habibali (UAE) beat Khaled Tarraf (LBN) 29-28. 86kg: Ali Takaloo (IRI) beat Emil Umayev (KAZ) 30-27.

91kg: Hamid Reza Kordabadi (IRI) beat Mohamad Osaily (LBN) RSC round 1. 91-plus kg: Mohammadrezapoor Shirmohammad (IRI) beat Abdulla Hasan (IRQ) 30-27.

Women's finals

45kg: Somruethai Siripathum (THA) beat Ha Huu Huynh (VIE) 30-27. 48kg: Thanawan Thongduang (THA) beat Colleen Saddi (PHI) 30-27.

51kg: Wansawang Srila Or (THA) beat Thuy Phuong Trieu (VIE) 29-28. 54kg: Ruchira Wongsriwo (THA) beat Zeinab Khatoun (LBN) 30-26.

57kg: Sara Idriss (LBN) beat Zahra Nasiri Bargh (IRI) 30-27. 60kg: Kaewrudee Kamtakrapoom (THA) beat Sedigheh Hajivand (IRI) TKO round 2.

63.5kg: Nadiya Moghaddam (IRI) w/o Reem Al Issa (JOR).

Dr Afridi's warning signs of digital addiction

Spending an excessive amount of time on the phone.

Neglecting personal, social, or academic responsibilities.

Losing interest in other activities or hobbies that were once enjoyed.

Having withdrawal symptoms like feeling anxious, restless, or upset when the technology is not available.

Experiencing sleep disturbances or changes in sleep patterns.

What are the guidelines?

Under 18 months: Avoid screen time altogether, except for video chatting with family.

Aged 18-24 months: If screens are introduced, it should be high-quality content watched with a caregiver to help the child understand what they are seeing.

Aged 2-5 years: Limit to one-hour per day of high-quality programming, with co-viewing whenever possible.

Aged 6-12 years: Set consistent limits on screen time to ensure it does not interfere with sleep, physical activity, or social interactions.

Teenagers: Encourage a balanced approach – screens should not replace sleep, exercise, or face-to-face socialisation.

Source: American Paediatric Association
In numbers: China in Dubai

The number of Chinese people living in Dubai: An estimated 200,000

Number of Chinese people in International City: Almost 50,000

Daily visitors to Dragon Mart in 2018/19: 120,000

Daily visitors to Dragon Mart in 2010: 20,000

Percentage increase in visitors in eight years: 500 per cent

Not Dark Yet

Shelby Lynne and Allison Moorer

Four stars

AI traffic lights to ease congestion at seven points to Sheikh Zayed bin Sultan Street

The seven points are:

Shakhbout bin Sultan Street

Dhafeer Street

Hadbat Al Ghubainah Street (outbound)

Salama bint Butti Street

Al Dhafra Street

Rabdan Street

Umm Yifina Street exit (inbound)

Need to know

Unlike other mobile wallets and payment apps, a unique feature of eWallet is that there is no need to have a bank account, credit or debit card to do digital payments.

Customers only need a valid Emirates ID and a working UAE mobile number to register for eWallet account.

Company Profile

Name: Thndr
Started: 2019
Co-founders: Ahmad Hammouda and Seif Amr
Sector: FinTech
Headquarters: Egypt
UAE base: Hub71, Abu Dhabi
Current number of staff: More than 150
Funds raised: $22 million

War and the virus
Key developments

All times UTC 4

What the law says

Micro-retirement is not a recognised concept or employment status under Federal Decree Law No. 33 of 2021 on the Regulation of Labour Relations (as amended) (UAE Labour Law). As such, it reflects a voluntary work-life balance practice, rather than a recognised legal employment category, according to Dilini Loku, senior associate for law firm Gateley Middle East.

“Some companies may offer formal sabbatical policies or career break programmes; however, beyond such arrangements, there is no automatic right or statutory entitlement to extended breaks,” she explains.

“Any leave taken beyond statutory entitlements, such as annual leave, is typically regarded as unpaid leave in accordance with Article 33 of the UAE Labour Law. While employees may legally take unpaid leave, such requests are subject to the employer’s discretion and require approval.”

If an employee resigns to pursue micro-retirement, the employment contract is terminated, and the employer is under no legal obligation to rehire the employee in the future unless specific contractual agreements are in place (such as return-to-work arrangements), which are generally uncommon, Ms Loku adds.

BMW M5 specs

Engine: 4.4-litre twin-turbo V-8 petrol enging with additional electric motor

Power: 727hp

Torque: 1,000Nm

Transmission: 8-speed auto

Fuel consumption: 10.6L/100km

On sale: Now

Price: From Dh650,000

Specs

Engine: Duel electric motors
Power: 659hp
Torque: 1075Nm
On sale: Available for pre-order now
Price: On request

Infiniti QX80 specs

Engine: twin-turbocharged 3.5-liter V6

Power: 450hp

Torque: 700Nm

Price: From Dh450,000, Autograph model from Dh510,000

Available: Now

The burning issue

The internal combustion engine is facing a watershed moment – major manufacturer Volvo is to stop producing petroleum-powered vehicles by 2021 and countries in Europe, including the UK, have vowed to ban their sale before 2040. The National takes a look at the story of one of the most successful technologies of the last 100 years and how it has impacted life in the UAE.

Read part three: the age of the electric vehicle begins

Read part two: how climate change drove the race for an alternative 

Read part one: how cars came to the UAE

Volvo ES90 Specs

Engine: Electric single motor (96kW), twin motor (106kW) and twin motor performance (106kW)

Power: 333hp, 449hp, 680hp

Torque: 480Nm, 670Nm, 870Nm

On sale: Later in 2025 or early 2026, depending on region

Price: Exact regional pricing TBA

The bio

Studied up to grade 12 in Vatanappally, a village in India’s southern Thrissur district

Was a middle distance state athletics champion in school

Enjoys driving to Fujairah and Ras Al Khaimah with family

His dream is to continue working as a social worker and help people

Has seven diaries in which he has jotted down notes about his work and money he earned

Keeps the diaries in his car to remember his journey in the Emirates

Getting there
Flydubai flies direct from Dubai to Tbilisi from Dh1,025 return including taxes

Kanye%20West
%3Cp%3EYe%20%E2%80%94%20the%20rapper%20formerly%20known%20as%20Kanye%20West%20%E2%80%94%20has%20seen%20his%20net%20worth%20fall%20to%20%24400%20million%20in%20recent%20weeks.%20That%E2%80%99s%20a%20precipitous%20drop%20from%20Bloomberg%E2%80%99s%20estimates%20of%20%246.8%20billion%20at%20the%20end%20of%202021.%3Cbr%3EYe%E2%80%99s%20wealth%20plunged%20after%20business%20partners%2C%20including%20Adidas%2C%20severed%20ties%20with%20him%20on%20the%20back%20of%20anti-Semitic%20remarks%20earlier%20this%20year.%3Cbr%3EWest%E2%80%99s%20present%20net%20worth%20derives%20from%20cash%2C%20his%20music%2C%20real%20estate%20and%20a%20stake%20in%20former%20wife%20Kim%20Kardashian%E2%80%99s%20shapewear%20firm%2C%20Skims.%3C%2Fp%3E%0A
Red flags
  • Promises of high, fixed or 'guaranteed' returns.
  • Unregulated structured products or complex investments often used to bypass traditional safeguards.
  • Lack of clear information, vague language, no access to audited financials.
  • Overseas companies targeting investors in other jurisdictions - this can make legal recovery difficult.
  • Hard-selling tactics - creating urgency, offering 'exclusive' deals.

Courtesy: Carol Glynn, founder of Conscious Finance Coaching

MO
%3Cp%3E%3Cstrong%3ECreators%3A%20%3C%2Fstrong%3EMohammed%20Amer%2C%20Ramy%20Youssef%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStars%3A%20%3C%2Fstrong%3EMohammed%20Amer%2C%20Teresa%20Ruiz%2C%20Omar%20Elba%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%204%2F5%3C%2Fp%3E%0A
RESULT

RS Leipzig 3 

Marcel Sabitzer 10', 21'

Emil Forsberg 87'

Tottenham 0

 

Fight Night

FIGHT NIGHT

Four title fights:

Amir Khan v Billy Dib - WBC International title
Hughie Fury v Samuel Peter - Heavyweight co-main event  
Dave Penalosa v Lerato Dlamini - WBC Silver title
Prince Patel v Michell Banquiz - IBO World title

Six undercard bouts:

Michael Hennessy Jr v Abdul Julaidan Fatah
Amandeep Singh v Shakhobidin Zoirov
Zuhayr Al Qahtani v Farhad Hazratzada
Lolito Sonsona v Isack Junior
Rodrigo Caraballo v Sajid Abid
Ali Kiydin v Hemi Ahio

Hurricanes 31-31 Lions

Wellington Hurricanes: 
Tries: Gibbins, Laumape, Goosen, Fifita tries, Barrett
Conversions: Barrett (4)
Penalties: Barrett

British & Irish Lions:
Tries: Seymour (2), North
Conversions: Biggar (2)
Penalties: Biggar (4)

The five pillars of Islam
Brief scores:

Toss: Nepal, chose to field

UAE 153-6: Shaiman (59), Usman (30); Regmi 2-23

Nepal 132-7: Jora 53 not out; Zahoor 2-17

Result: UAE won by 21 runs

Series: UAE lead 1-0

The years Ramadan fell in May

1987

1954

1921

1888

Updated: April 20, 2023, 1:26 PM`